How so? The rope as the exact same contact with the aluminum ring, be it one or two. With two it is only in contact with 1/2 of the ring on each, which equals the same had it been one ring.
The rope fibers are not short. They run the full length of the rope. They are not like the old ropes where a bunch of short fibers are wound together to make a long rope.
Sorry, but that theory doesn't hold water.
In fact, with two rings you are asking the rope to flex more than with one ring. Make the bend radius, straighten out, then make the bend radius again, then straighten out. With one ring you are just asking it to make the bend radius once and then straighten out. With two you are just flexing the rope twice as much.
Even if what you say was true, will you notice the rope lasting any longer? And if you did, would that tad bit of extra life be worth the 30-60 dollars extra you spent on that second ring?
But they look cool. I actually have one myself. Someday I will take it apart and make two useful singles out of it.